Collection Method detect
Sends lnkMessage for each element within this collection,
passing the element to the invoked method until one of the
elements causes lnkMessage to return true (1).
lnkMessage is a Callback pointing to a method which
expects an element as a parameter and returns a pic x
comp-5.
If the Callback returns true (1), then the element that
caused this is returned in lnkElement and lnkMessage is not
sent to any more elements.
If no element causes lnkMessage to return true then an
exception is raised.
Using Parameters
Returning Parameter